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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,095,218	$ 2,087,881
Allowance for Credit Losses	(13,127)	(7,604)	$ (5,069)	$ (3,952)
Gross Unrealized Gains	4,635	732
Gross Unrealized Losses	(62,289)	(95,571)
Fair Value	2,024,437	1,985,438
Equity securities	33,118	34,256
Total investment securities, at fair value	2,057,555	2,019,694
Available-for-sale debt securities, accrued interest	12,400	15,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	169,570	14,820
Allowance for Credit Losses	(353)	(362)	(450)	(483)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(742)	(1,222)
Fair Value	168,475	13,236
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	322,646	330,637
Allowance for Credit Losses	0	0
Gross Unrealized Gains	1,349	146
Gross Unrealized Losses	(1,111)	(3,745)
Fair Value	322,884	327,038
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	236,386	242,858
Allowance for Credit Losses	0	0
Gross Unrealized Gains	2,037	0
Gross Unrealized Losses	(10,080)	(16,112)
Fair Value	228,343	226,746
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95,734	95,850
Allowance for Credit Losses	0	0
Gross Unrealized Gains	269	44
Gross Unrealized Losses	(2,256)	(2,819)
Fair Value	93,747	93,075
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	187,703	257,500
Allowance for Credit Losses	0	0
Gross Unrealized Gains	66	100
Gross Unrealized Losses	(290)	(2,193)
Fair Value	187,479	255,407
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	76,008	78,707
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(999)
Fair Value	76,008	77,708
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	518,545	564,524
Allowance for Credit Losses	(12,774)	(7,135)	$ (4,619)	$ (3,469)
Gross Unrealized Gains	914	347
Gross Unrealized Losses	(24,324)	(41,406)
Fair Value	482,361	516,330
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	488,626	502,985
Allowance for Credit Losses	0	(107)
Gross Unrealized Gains	0	95
Gross Unrealized Losses	(23,486)	(27,075)
Fair Value	$ 465,140	$ 475,898

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